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Traxler



Joined: 30 Oct 2014
Posts: 12
Traxler
Hello 'world'


buffer db ?
buffersize = $ - buffer
invoke GetCurrentDirectory,buffersize,buffer

how do I declare variables so that the current directory can be copied to text file with WriteFile ?
if someone had a small example.

thank you for your help
Post 30 Oct 2014, 18:26
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shutdownall



Joined: 02 Apr 2010
Posts: 518
Location: Munich
shutdownall
Regarding this

Code:
DWORD WINAPI GetCurrentDirectory(
  _In_   DWORD nBufferLength,
  _Out_  LPTSTR lpBuffer
);
    


you can code it like this:

Code:
buffer db 200h dup(0)
buffersize = $ - buffer
invoke GetCurrentDirectory,buffersize,buffer
    
Post 30 Oct 2014, 20:30
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typedef



Joined: 25 Jul 2010
Posts: 2913
Location: 0x77760000
typedef
Code:

invoke GetCurrentDirectoryA, PATH_LENGTH, pszBuffer
invoke CreateFileA, pszFileName, 0, GENERIC_WRITE, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
invoke lstrlenA,  pszBuffer
invoke WriteFile, [hFile], pszBuffer, eax, dwWritten, 0
invoke CloseHandle, [hFile]

    
Post 31 Oct 2014, 02:24
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Traxler



Joined: 30 Oct 2014
Posts: 12
Traxler
buffer db 200 dup(0) instead of buffer db ? solved my problem
Thans a lot.

Laughing

shutdownall wrote:
Regarding this

Code:
DWORD WINAPI GetCurrentDirectory(
  _In_   DWORD nBufferLength,
  _Out_  LPTSTR lpBuffer
);
    


you can code it like this:

Code:
buffer db 200h dup(0)
buffersize = $ - buffer
invoke GetCurrentDirectory,buffersize,buffer
    
Post 31 Oct 2014, 09:19
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Picnic



Joined: 05 May 2007
Posts: 1288
Location: behind the arc
Picnic
typedef wrote:
Code:

invoke GetCurrentDirectoryA, PATH_LENGTH, pszBuffer
invoke CreateFileA, pszFileName, 0, GENERIC_WRITE, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
invoke lstrlenA,  pszBuffer
invoke WriteFile, [hFile], pszBuffer, eax, dwWritten, 0
invoke CloseHandle, [hFile]

    


Mind the handle Wink
Code:
invoke CreateFileA, pszFileName, 0, GENERIC_WRITE, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
mov [hFile], eax
    
Post 01 Nov 2014, 15:12
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typedef



Joined: 25 Jul 2010
Posts: 2913
Location: 0x77760000
typedef
Yeah. I left out a lot assuming that they know how to weave that code together.
Post 01 Nov 2014, 20:43
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shutdownall



Joined: 02 Apr 2010
Posts: 518
Location: Munich
shutdownall
Traxler wrote:
buffer db 200 dup(0) instead of buffer db ? solved my problem
Thans a lot.

Laughing


Just in case, the 200 means the size of the buffer.
So for bigger directories you may choose more buffer (1000h = 4096 bytes) and to be more general it would be good to allocate memory dynamically. But this maybe too much for a hello world project. Wink
Post 02 Nov 2014, 13:55
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baldr



Joined: 19 Mar 2008
Posts: 1651
baldr
shutdownall,

Dynamic allocation is good when data is really dynamic.
Post 02 Nov 2014, 15:44
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TheRaven



Joined: 22 Apr 2008
Posts: 89
Location: U.S.A.
TheRaven
Traxler wrote:
buffer db 200 dup(0) instead of buffer db ? solved my problem
Thans a lot.

Laughing
you can code it like this:



Buffer sizes are explicit with Windows and a ? in best case scenario will result in a buffer of zero length. By general convention, text file buffers are 1024 or a megabyte.

_________________
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I'm not insane, I know the voices in my head aren't real!
Post 15 Jan 2015, 13:37
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macgub



Joined: 11 Jan 2006
Posts: 238
Location: Poland
macgub
Hi. I have similar problem. I have something write to file. But there are some problems with file handler. File appears only if I leave program and ex. change current directory Who help me fix my code Question
Code:
;--code

    invoke  GetStdHandle, STD_OUTPUT_HANDLE
    mov  [file_handle],eax
    invoke  CreateFile,file_name, GENERIC_WRITE, 0, 0,CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
    invoke  WriteFile,eax,file_buffer,[file_size], byteswritten, 0
    invoke  CloseHandle,[file_handle]

;--data
  file_handle dd ?
  file buffer rb 65536                                        
  bytes_written dd ?    

    
Post 16 Jan 2015, 11:16
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AsmGuru62



Joined: 28 Jan 2004
Posts: 1409
Location: Toronto, Canada
AsmGuru62
Not sure what do you want to do with the code.
When you close the handle - you're closing the handle returned by GetStdHandle(), not the one returned by CreateFile().
Also, [file_size] and [file_name] are not declared.
Post 16 Jan 2015, 16:33
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macgub



Joined: 11 Jan 2006
Posts: 238
Location: Poland
macgub
Now the code is:
Code:
;---code
  invoke  CreateFile,file_name, GENERIC_WRITE, 0, 0,CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0
    mov  [file_handle],eax
    invoke  WriteFile,eax,file_buffer,[file_size], byteswritten, 0
    invoke  CloseHandle,[file_handle]  ]    
    
;--data
   file_handle dd ? 
  file buffer rb 65536                                         
  bytes_written dd ?     
 file_name    db 'surface.3ds',0 
file_size dd 1024

    

And all works as I want. Thanks AsmGuru62 for the tip.

[/b]
Post 16 Jan 2015, 16:47
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bitshifter



Joined: 04 Dec 2007
Posts: 764
Location: Massachusetts, USA
bitshifter
my win32 version, was bored...
Code:
format PE GUI 4.0
entry start

include 'win32axp.inc'

section '.text' code readable executable

 start:
        invoke GetCurrentDirectoryA,0,0
        mov [dwLength],eax

        invoke LocalAlloc,LPTR,[dwLength]
        mov [pszBuffer],eax

        invoke GetCurrentDirectoryA,[dwLength],[pszBuffer]

        invoke  CreateFileA,pszFileName,GENERIC_WRITE,0,0,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,0
        mov [hOutputFile],eax

        mov eax,[dwLength]
        sub eax,sizeof.TCHAR
        invoke WriteFile,[hOutputFile],[pszBuffer],eax,dwBytesWritten,0

        invoke CloseHandle,[hOutputFile]

        invoke LocalFree,[pszBuffer]

        invoke ExitProcess,0

section '.data' data readable writeable

 pszFileName db 'spit.txt',0
 hOutputFile dd INVALID_HANDLE_VALUE
 dwBytesWritten dd ?
 pszBuffer dd ?
 dwLength dd ?

section '.idata' import data readable

 library kernel32,'KERNEL32.DLL',\
         user32,'USER32.DLL'

 include 'api\kernel32.inc'
 include 'api\user32.inc'
    

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you just have to keep focused and take it one 'byte' at a time.
Post 17 Jan 2015, 05:41
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